// misc utility functions for javascript

// all parameters should be strings, use "yes" or "no" for booleans
function launchWin(dest, width, height, showToolbar, showMenubar, showStatusbar,
                   showScrollbars, showLocation, isResizable) {
  popUp = window.open(dest,"popUp",
                "width=" + width + "," +
                "height=" + height + "," +
                "toolbar=" + showToolbar + "," +
                "menubar=" + showMenubar + "," +
                "status=" + showStatusbar + "," +
                "scrollbars=" + showScrollbars + "," +
                "location=" + showLocation + "," +
                "resizable=" + isResizable);
  popUp.focus();
}

// launches window positioned in the center of the screen
// all parameters should be strings, use "yes" or "no" for booleans
function launchWinCS(dest, width, height, showToolbar, showMenubar, showStatusbar,
                   showScrollbars, showLocation, isResizable) {
  var winL = ((screen.width / 2) - (width / 2));
  var winT = ((screen.height / 2) - (height / 2));
  popUp = window.open(dest,"popUp",
                "width=" + width + "," +
                "height=" + height + "," +
                "left=" + winL + "," +
                "top=" + winT + "," +
                "toolbar=" + showToolbar + "," +
                "menubar=" + showMenubar + "," +
                "status=" + showStatusbar + "," +
                "scrollbars=" + showScrollbars + "," +
                "location=" + showLocation + "," +
                "resizable=" + isResizable);
  popUp.focus();
}

// handles alerting the user of too many characters in a field
function doLimitLength(field, maxLen, fieldName) {
  if (field.value.length > maxLen) {
    alert('You have exceded ' + maxLen + ' characters for the ' + fieldName + ' field.  Please delete at least ' + (field.value.length - maxLen) + ' character(s).');
    field.focus();
  }
}

// used for date selection forms
function setDays(mf, df, yf, topBlank) {
  var m;
  var y;
  var idxCheck = (topBlank) ? 1 : 0;

  if (mf.selectedIndex < idxCheck) {
    m = 1;
  } else {
    m = mf.options[mf.selectedIndex].value;
  }

  if (yf.selectedIndex < idxCheck) {
    y = 2002;
  } else {
    y = yf.options[yf.selectedIndex].value;
  }

  var nd = 31 + idxCheck;
  if (m == 4 || m == 6 || m == 9 || m == 11) {
    nd -= 1;
  } else if (m == 2) {
    if ((y % 400 == 0) || ((y % 4 == 0) && (y % 100 != 0)))
      nd -= 2;
    else
      nd -= 3;
  }

  var prevDaySel = df.selectedIndex;
  while (df.options.length < nd) {
    var nextDay;
    if (topBlank)
      nextDay = df.options.length;
    else
      nextDay = df.options.length + 1;

    df.options[df.options.length] = new Option(nextDay, nextDay);
  }

  if (df.options.length > nd)
    df.options.length = nd;

  if (prevDaySel >= df.options.length)
    df.selectedIndex = df.options.length - 1;
}